Suppress events for intermediate window/tab/buffer changes (#1026)

* Add an optional parameter to neredtree#exec to suppress all events.

The value doesn't matter, but 1 is a good choice. Its presence is an
indicator that tells NERDTree to tell Vim to ignore all events. I'm not
yet sure if there needs to be an else section to that if block. It may
be OK to allow all events to fire in the right situations.

* Supress events in all intermediate nerdtree#exec calls.

Finding all the right function calls is the key here.

* Make ignoreAll a required parameter to nerdtree#exec().

* Put required ignoreAll argument (==0) in where it's now needed.

* Ignore events when creating a new vertical split.

* Ignore events when closing NERDTree. This may need to be reverted.

* Remove debugging statment and commented-out code.

* Wrap remaining buffer/window-switching commands in nerdtree#exec().

* Update version number.

* Add a space between arguments in nerdtree#exec() calls.

lib/nerdtree/opener.vim

@@ -107,10 +107,10 @@ function! s:Opener._isWindowUsable(winnumber)
     endif
 
     let oldwinnr = winnr()
-    call nerdtree#exec(a:winnumber . "wincmd p")
+    call nerdtree#exec(a:winnumber . "wincmd p", 1)
     let specialWindow = getbufvar("%", '&buftype') != '' || getwinvar('%', '&previewwindow')
     let modified = &modified
-    call nerdtree#exec(oldwinnr . "wincmd p")
+    call nerdtree#exec(oldwinnr . "wincmd p", 1)
 
     "if its a special window e.g. quickfix or another explorer plugin then we
     "have to split
@@ -172,7 +172,7 @@ function! s:Opener._newSplit()
     let below=0
 
     " Attempt to go to adjacent window
-    call nerdtree#exec(back)
+    call nerdtree#exec(back, 1)
 
     let onlyOneWin = (winnr("$") ==# 1)
 
@@ -201,9 +201,9 @@ function! s:Opener._newSplit()
     "resize the tree window if no other window was open before
     if onlyOneWin
         let size = exists("b:NERDTreeOldWindowSize") ? b:NERDTreeOldWindowSize : g:NERDTreeWinSize
-        call nerdtree#exec(there)
+        call nerdtree#exec(there, 1)
         exec("silent ". splitMode ." resize ". size)
-        call nerdtree#exec('wincmd p')
+        call nerdtree#exec('wincmd p', 0)
     endif
 
     " Restore splitmode settings
@@ -219,8 +219,8 @@ function! s:Opener._newVSplit()
         let l:winwidth = g:NERDTreeWinSize
     endif
 
-    call nerdtree#exec('wincmd p')
-    vnew
+    call nerdtree#exec('wincmd p', 1)
+    call nerdtree#exec('vnew', 1)
 
     let l:currentWindowNumber = winnr()
 
@@ -228,7 +228,7 @@ function! s:Opener._newVSplit()
     call g:NERDTree.CursorToTreeWin()
     execute 'silent vertical resize ' . l:winwidth
 
-    call nerdtree#exec(l:currentWindowNumber . 'wincmd w')
+    call nerdtree#exec(l:currentWindowNumber . 'wincmd w', 0)
 endfunction
 
 " FUNCTION: Opener.open(target) {{{1
@@ -290,9 +290,9 @@ function! s:Opener._previousWindow()
     else
         try
             if !self._isWindowUsable(winnr("#"))
-                call nerdtree#exec(self._firstUsableWindow() . "wincmd w")
+                call nerdtree#exec(self._firstUsableWindow() . "wincmd w", 1)
             else
-                call nerdtree#exec('wincmd p')
+                call nerdtree#exec('wincmd p', 1)
             endif
         catch /^Vim\%((\a\+)\)\=:E37/
             call g:NERDTree.CursorToTreeWin()
@@ -305,8 +305,8 @@ endfunction
 
 " FUNCTION: Opener._restoreCursorPos() {{{1
 function! s:Opener._restoreCursorPos()
-    call nerdtree#exec(self._tabnr . 'tabnext')
-    call nerdtree#exec(bufwinnr(self._bufnr) . 'wincmd w')
+    call nerdtree#exec(self._tabnr . 'tabnext', 1)
+    call nerdtree#exec(bufwinnr(self._bufnr) . 'wincmd w', 1)
 endfunction
 
 " FUNCTION: Opener._reuseWindow() {{{1
@@ -321,7 +321,7 @@ function! s:Opener._reuseWindow()
     "check the current tab for the window
     let winnr = bufwinnr('^' . self._path.str() . '$')
     if winnr != -1
-        call nerdtree#exec(winnr . "wincmd w")
+        call nerdtree#exec(winnr . "wincmd w", 0)
         call self._checkToCloseTree(0)
         return 1
     endif
@@ -334,9 +334,9 @@ function! s:Opener._reuseWindow()
     let tabnr = self._path.tabnr()
     if tabnr
         call self._checkToCloseTree(1)
-        call nerdtree#exec(tabnr . 'tabnext')
+        call nerdtree#exec(tabnr . 'tabnext', 1)
         let winnr = bufwinnr('^' . self._path.str() . '$')
-        call nerdtree#exec(winnr . "wincmd w")
+        call nerdtree#exec(winnr . "wincmd w", 0)
         return 1
     endif